1.自定义事件触发 .cpcstartrefresh的点击事件，但是每次都会触发2次点击事件

2.代码如下：
window.onmessage = function (e) {
// 创建一个事件对象，

    var myEvent = document.createEvent('Event');
    myEvent.initEvent('click', false, false);
    e = e || event;
    e.eventType = 'message';
    if (e.data === 'returnfromsht') {
         console.log(e.data, 'returnfromsht4');
         
         //每次都触发2次点击
         document.getElementsByClassName('cpcstartrefresh')[0].dispatchEvent(myEvent);
         
    } else if (e.data === 'maximumwindow') {
        console.log(e.data, 'maximumwindow');
    }
};